Partitioned: All third-party storage access requests

Firefox:

CookiePartitionedForeign=Partitioned cookie
or storage access was provided to "<URL>" because it is loaded in the
third-party context and storage partitioning is enabled.

A request to access cookies or storage was partitioned because it came from a third-party (a different origin) and dynamic state partitioning is enabled.

With Dynamic State Partitioning enabled, Firefox provides embedded resources with a separate storage bucket for every top-level website. Embedded third-parties may request access to the top-level storage bucket via the Storage Access API. You can also disable Dynamic State Partitioning with the network.cookie.cookieBehavior pref.

• State Partitioning